Rinnosuke got a whole book of side stories all from his perspective, which makes him well-established compared to several characters that were one-off bosses.
The fandom is a weird thing, because characters like Daiyousei and Koakuma (who literally never have a single line of dialog) get promoted to Main Background Character and main series bosses are never heard from again. Stage 1 and Stage 2 bosses are particularly likely to vanish into obscurity, unless some spicy meme saves them (like Chen and bkub).
As far as content, the series has 21 modern games, two collections of short stories, six artbooks (which often contain short stories and whatnot) and eight different manga, so there's actually a fair amount of content and characterization for a good portion of the cast.>Nazrin
Damn. Her shtick is "finding things" (and having a horde of mice, I guess), so I thought the ability to self-mill and Regrowth was a good fit. Maybe ditching the blue and self-mill entirely will make it cleaner.>card
Thassa/Geist of the Archives/Lifecrafter Bestiary. Cheaper and more scry, but hands out scries to your opponent as well.
In writing this card I learned that your effects can demand you scry but will always allow others to decline a scry, because the 3rd person "scries" doesn't show up anywhere. Its always "that player may scry".